[interpreter] Add basic framework for bytecode handler code generation.

src/compiler/linkage.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_LINKAGE_H_
 #define V8_COMPILER_LINKAGE_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/machine-type.h"
@@ skipping 223 matching lines @@
   // Creates a call descriptor for simplified C calls that is appropriate
   // for the host platform. This simplified calling convention only supports
   // integers and pointers of one word size each, i.e. no floating point,
   // structs, pointers to members, etc.
   static CallDescriptor* GetSimplifiedCDescriptor(Zone* zone,
                                                   const MachineSignature* sig);
 
   // Creates a call descriptor for interpreter handler code stubs. These are not
   // intended to be called directly but are instead dispatched to by the
   // interpreter.
-  static CallDescriptor* GetInterpreterDispatchDescriptor(
-      Zone* zone, const MachineSignature* sig);
+  static CallDescriptor* GetInterpreterDispatchDescriptor(Zone* zone);
 
   // Get the location of an (incoming) parameter to this function.
   LinkageLocation GetParameterLocation(int index) const {
     return incoming_->GetInputLocation(index + 1);  // + 1 to skip target.
   }
 
   // Get the machine type of an (incoming) parameter to this function.
   MachineType GetParameterType(int index) const {
     return incoming_->GetInputType(index + 1);  // + 1 to skip target.
   }
@@ skipping 17 matching lines @@
 
   // Get the location where an incoming OSR value is stored.
   LinkageLocation GetOsrValueLocation(int index) const;
 
   // A special parameter index for JSCalls that represents the closure.
   static const int kJSFunctionCallClosureParamIndex = -1;
 
   // A special {OsrValue} index to indicate the context spill slot.
   static const int kOsrContextSpillSlotIndex = -1;
 
+  // Special parameters used to pass fixed register data through interpreter

[Michael Starzinger, 2015/07/21 13:51:45]

nit: s/parameters/parameter indices/

[rmcilroy, 2015/07/23 10:43:54]

Done.

+  // dispatches.
+  static const int kInterpreterBytecodeParameter = 0;
+  static const int kInterpreterDispatchTableParameter = 1;
+
  private:
   CallDescriptor* const incoming_;
 
   DISALLOW_COPY_AND_ASSIGN(Linkage);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_H_